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    <title>Document</title>
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  <ul>
    <li>
      <div class="box">
        <div class="a">学什么不好</div>
        <div class="b">非得学前端</div>
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    <li>
      <div class="box">
        <div class="a">html5</div>
        <div class="b">css3</div>
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    </li>
    <li>
      <div class="box">
        <div class="a">JavaScript</div>
        <div class="b">jQuery</div>
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    </li>
    <li>
      <div class="box">
        <div class="a">Ajax</div>
        <div class="b">axios</div>
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    </li>
    <li>
      <div class="box">
        <div class="a">vue</div>
        <div class="b">recat</div>
      </div>
    </li>


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